<mat-toolbar color="primary">
  <button mat-button (click)="openSidebar($event)">
    <mat-icon>menu</mat-icon>
  </button>
  <span>MyApp</span>
  <div class="fill-remain-content"></div>
  <mat-slide-toggle (change)="toggleTheme($event.checked)"></mat-slide-toggle>
</mat-toolbar>
